We use too and either at the end of a sentence.
|We use too after a positive verb:||We use either after a negative verb:|
|• A: I‘m happy.||• A: I‘m not happy.|
|B: I’m happy too.||B: I‘m not happy either, (not ‘I‘m not… too’)|
|• A: I enjoyed the film.||• A: I can’t cook.|
|B: I enjoyed it too.||B: I can‘t either, (not ‘I can’t too’)|
|• Mary is a doctor. Her husband is a doctor too.||• Bill doesn’t watch TV. He doesn‘t read newspapers either.|